After three weeks preparation in normal conditions, males (N = 19) performed resistance training of the quadriceps femoris (low resistance, high repetitions, knee extension) three times a week for four weeks. Ss were divided into two groups: normobaric hypoxia and normoxia. Strength endurance gains were measured as the work performed in an all-out test on an isokinetic device.

Improvements were significant in both conditions, with the hypoxic condition producing larger but not significantly different gains. Cross-sectional area of the quadriceps femoris only improved significantly in the normoxic condition.